/*
 * Copyright &copy; 2011 Rebecca G. Bettencourt / Kreative Software
 * <p>
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * <a href="http://www.mozilla.org/MPL/">http://www.mozilla.org/MPL/</a>
 * <p>
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 * <p>
 * Alternatively, the contents of this file may be used under the terms
 * of the GNU Lesser General Public License (the "LGPL License"), in which
 * case the provisions of LGPL License are applicable instead of those
 * above. If you wish to allow use of your version of this file only
 * under the terms of the LGPL License and not to allow others to use
 * your version of this file under the MPL, indicate your decision by
 * deleting the provisions above and replace them with the notice and
 * other provisions required by the LGPL License. If you do not delete
 * the provisions above, a recipient may use your version of this file
 * under either the MPL or the LGPL License.
 * @since OpenXION 1.4
 * @author Rebecca G. Bettencourt, Kreative Software
 */

package com.kreative.openxion.format;

import java.util.List;
import com.kreative.openxion.XNContext;
import com.kreative.openxion.xom.XOMVariant;
import com.kreative.openxion.xom.inst.XOMEmpty;

public class ParameterFormatStringComponent implements FormatStringComponent {
	private int parameterNumber;
	private Formatter formatter;
	
	public ParameterFormatStringComponent(int parameterNumber, Formatter formatter) {
		this.parameterNumber = (parameterNumber < 0) ? 0 : parameterNumber;
		this.formatter = (formatter == null) ? Formatter.StringFormatter : formatter;
	}
	
	@Override
	public String format(XNContext ctx, List<? extends XOMVariant> vs) {
		return formatter.format(ctx, (parameterNumber < vs.size()) ? vs.get(parameterNumber) : XOMEmpty.EMPTY);
	}
}
